Telephone system.



M. E. GRUNVIGH. TELEPHONE SYSTEM.

I APPLICIATIMT FILED 41x15, 1913.

1,067,606 Patented 15, 1913.

3 SKEETS5HEBT l.

WITH/E8858} k/wf M. E. GB ZJ NVIGH. TELEPHONE SYSTEM.

APPLICATION FILED APR. 15. 1913.

1,067,606, Patented July 15, 1913;

WITNESSES M. E. GR'G'NVIGH.

TELEPHONE SYSTEM.

APPLIGATION FILED APR. 191 3.

Patented 51 3 1 3 SHEETSSHEET 3.

UNITED STATES PATENT anion.

EARTINUS E. GRljNVIGH, OF BERGER, NORWAY, ASSIGNOB OF ONE-HALF TO THEMES regr 1 .Ocncoc.

Specification of Letters Patent.

S. PUKERUD, 0F WILKINSBURG, PENNSYLVANlA.

TELEPHONE SYSTEM.

Patented July :15,

Application filed April 15, 1913. Serial No. 781,177.,

To all whom it may concern.

ie it known that I. MAnrmts E. Gnosrion, a subject of the King of Norway, and

a resident of Bergen, Norway, have invented certain new and useful Improvements-1n Telephone Systems, of which the following is aspecification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to electrical distributing systems and particularly to under ground systems of distribution for telephone cables.

One object of my invention is to provide a. system. of the character above indicated that scale. of a single zone. such as may form a part of the system of Fig. 1. An elevation of a connection box is shown on. a st1ll larger scale in Fig. 3 together wit-h its clrcu t conncctions. Fig. 4: is a transverse sectional elevation of the connection box shown 1n Fig. 3.

Like characters of reference designate corresponding parts-in all the figures. For clearness in illustration, only a small number of distributing zones are shown in the diagrammatic view of Fig. 1, but my invention is of course not limited to any specific number, size or arrangement of zones and has been and usually will be utilized where a large number of zones is desirable.

-With special reference to Fig. 1, X repre sents a telephone exchange or central, fronr which trunk line cables 1 and .2 radiate. These trunk line cables are preferably laid under-ground and terminate in distributing boxes or manholes s and t. A plurality of district cables Z, m, n, radiate from the distributionbox s and district cables 0, 12, -11, radiate from distribution box If.

The system comprises zones A. B and C and each of the district cables is intended to be connected to one or more zone cables, as for examplea zone cable 10 of zone A is connected to the district cable m, and zone cable 11 of zoneB is connectedto both of the district cables at and 0. The zone cable 12 of zone C is connected directly to central by a district cable 7.

- Each of the zone cables is laid completely around a comparatively small area as for example a city block which includes number of subscribers or prospective subscribers. If a city is to be laid out in accordance with this system, it will first be divided intozones, and a zone cable will, be laid completely around each zone. The zones which are jacent to central will be connected thereto by district cables. The distribution boxes will then be located at convenient points at a distance from central and the various zone cables will be connected to the nearestdistributing boxes by district cables.

My invention is not concerned with the details of the trunk lines or district cables and consequently this part of the system. need not be more specifically described.

In Fig. 2, I. have shown a typical zone arrangement in which the single wires consti; tuting the zone cable are shown arranged in pairs in accordance with a Well known cable construction. In this zone are a plurality of buildings or residences 20, 22, 2e, 26, 27. 28, 29, 31, 33, 3-5 and 36 and vacant plots 0t ground 21, 23, 25,30, 32, '84: and 37.

y The zone cable-1O is represented as com posed of eight pairs of Wires 41 to 48 inclu sive. A predetermined number of these pairs ofwires are looped into each of the buildings or residences of the zone the numher in each case being dependent upon the number of subscribers or prospective subscribers in the building, allowing for probable future conditions.

Each building is provided with a connection box 50. shown in Figs. 3 and 4, which comprises a baseplate 51, a channel-shaped body 52 of wood or other insulating material. and a plurality oftermiuals secured to the bottom surface of the channel (which is the outer surface -ofjthe bozg) and insulatcd from ametal plate 54 by which the surface is protected. A removable cap screw ,55. is secured to the head of each terminal so that opposite terminals, which are arranged in two parallel rows, may be joined by connectors or jumpersbfi. Thexjumpers-conlo ground and arranged lo prevent leak ugc l ween lhc contact lermiuels of the box. college to ground being usually con- -1idcrerl. preferable. although of course no lculccge contemplated or desired.

The structiu'e' of the terminal box is not mulecial to my invention and may be vuried as desired. i

in one of the buildings there are no 1 subscribers each pail of terminals will be provide Ll with conneclors as in building 26 of Fig.

Each pair of wines is led or looped into two or more buildings of the zone. For ex ample lhc wires l1 are looped into buildings ill and 35; lhc wires 42 into buildings 2? and 2c; the wires 43 into buildings 20. 323 33?. 2Q. and 31, etc. i

In the specific arrangement shown in l ig. 2, (the number of. wires being chosen merely illustru'ie the principles ofthe invontion} provision is made for eight" 'subocrlherzs in buildings 20, '29 33 and 3b, for six subscribers in buildings 22; 24. 27, 28 31- und and four subscribers in build.- .iuggi'.

By su 11g the zone cable as more fully pombed out hereinafter, the system is capable of enlorgei'oeht ithout, increasing pairs of wires in lliezone lol'ol of seventy-two subscribend connected its TLC-l cable as shown in Fig; 2 r lire. only, possible to serve sixteen s there are only eight pairs of .wii in zone cable. now explain how any number of here up to sixteen'can be served withour. inching; billy elleml'iotns in the zone ca hlc except oi; the connection boxes even though the number and locecion of subscribers in he vm ious huildingomay he frequently cl'iahged.

Assuming fol: example, that two telephones 60 zind 61 Me connected repetitively across the left hood terminals to which wires and ore connected end that. connectors r junior-arc 6:211:16. 63 complete a. through "HIZE'ASOUOH :Eor the wires 47 and M. The l8 and 13 are thus utilized from tele phones 6%) and 61 to central. Anolher tele- Jmhe iclghi'. be connected across terminals e'iill another across terminals 65 if hotif, or; shown in the drawing;-.-, 's; we ho d so connected, the licrfni e not coonecled to cnvlhing. The opcl the zone cable -18 is l'mwev er coiuzemcd lhmngh jum'fieis 56 in building the example chosen. )le arranged in a, single ends towo'acoc 3,6 to a telephone 6? in building 29, the iutervcning section of the wires 48 between lhe buildings 29 and being inactive. Similarly the wires 43 at the opposite end of the zone cable are connected through jumpers 68 of building 31, and jumpers 69 of building 29 lo the telephone 79 of build ing' 28. In like manner a. telephone 71 of building 22, connected to one end of Wires 47 and a, telephone 72 of building 86 to the other. Building similarly provided with a telephone 73,.building 27 with lelephones Z4: and 75, buildiiig 31 with tale phones '76 end 77, building 33 with telephones 78 and 79 andhuilding with o. to phone 80. The actual number of subscric in use with the arrangement illustrated therefore fourteen.

Assuming that the building 20 requii'cu on additional telephone, this zucy be providcd for by changing telephone Tl of buildingz; 22 from wires 1? to wires 4-6, reuu'rc log the jumpers 81, placing; jumpers 82 m: shown'in dotted lines in buildingfl, rci'uoring jumpers 62 of building 20 and coucooling the new "telephone across the low minals 83.

If the telephone 78 in the building 32 lo removed jumpefs 84 (shown in dolled lines), will be placed on the connection box of the building 33 and then it will poe;- ;lble to provide a new telephone either on terminals 85 of building 24 or on lerminelo 86 of buildinq 22.

From the: foregoing it is evident tha'lx by various simple changes the subscribers; may be rearranged and distributed among the various buildings at; will although the in" crease is limited to a maximum of sixteen subscribers. If however, it becomes ucccesary to still further increase the number of. subscribers, the zone cable may be intercuy; ed at; another point in the loop as indicziled in dotted lincs'in Fig. 2 the ends thus provided being connected to another dislrilr uting box or man hole through it own die 'trict cable.

Including the dotted line connections lZl'iG zone of Fig. 2 corresponds (10 the cone B of Fig. 1, and the number-of possible subscribers is increased to l'hirty-lwo Wllhoul digging up or altering the' zone cable itself in any way except-at the one 'po'it'ol.

ll. will thus be readily underclood by those skilled in the art, that the dislrict :1 11d 7% tru k line cables which rep'rescnl. a consirlm able proportion of the initial loves-li need only be laid as the demand r-co While iii; the same time it is not heel to continually. dig up thefihoroughlaro rearrange or duplicate the zone cables cl selves.

ll clear lhel it not importcrh; Wires of the zone cable are looped particular building so long the i menace Whatdnlexcesfi the required for the subscribers oi. building. dlhe telephone in two or more buildings may then he changed one set of wires to another D1, necessary in order to permit a desired increase in the subscribers-in some other building in the zone;

If a new building is erected asflfor exanipic on a plot of ground-marked, 25 in Fig. 2, will then'of course be necessary to pgovide loops from certain of the pairs of wires which constitute the zone cable, but this process will'be comparable to. the usual connections which are established tonew buildings fromthewater and gas mains and can b s-accomplished at the same time with out adding materially to the upheaval which usually-accompanies such operations. The connection boxes themselves may of course be located in any ings and may be as rea ily accessible for adjustment of connections as Water and gas meters are accessible for inspection.

The advantages of my invention are many and need not be enumerated with further detail. The system is less expensive toinstal and more flexible than any of the Well known under ground systems heretofore used. The zone cable may of course be still further sub-divided and new connections to com tral established. Each time anysection of the zone cable is thus sub-divided the number of possible subscribers in the section is multiplied by two. While I have shown a two wire metallic return system, my invention may be .embodied in a one wire, ground return system. in factit may be found desirable to change from the one to the other iii order to in 'merely for convenience in describing the system and have no special significance and the term building is intended to apply to any building or station'in which telephones of the system are likely to be located.

The zone cable wires may of course be led into the buildings or'stations without being interrupted, and then cut and connected tothe telephones as required instead of being cutin the first instance and connected to terminals in the buildings or stations.

Various modifications in the circuit conart of the build burr neotions and in the arrangement of the connection boxes, and in the method of connecting back from the zone cables to central, may be employed within the spirit and scope of my invention and Idesire that only such limitations be imposed as are indicated in the appended claims.

What I claim is:

l. A telephone system comprising a plurality of buildings or stations, at set of terminals in each building, removable jumpers for interconnecting said terminals in pairs, a zone cable composed of a plurality of pairs of wires laid adjacent to a predetermined group of, buildings constituting a zone, a central station, and means for connecting each end of the zone cable thereto, certain Wires of said zone cable being interrupted, led into certain of the buildings and connected to said terminals therein, whereby a pain of zone cable wires is found in more thanone building of the zone and may be used many one of said buildings as desired. 2. A telephone system comprising,aplurality of buildings or stations, a connection box in each building having a plurality of pairs of terminals, removable jumpers for interconnecting pairs of said terminals, a

zone cable composed of a plurality of pairs of wires laid adjacent to a predetermined group of said buildings constituting av zone, a central station, a plurality of distribution boxes connected thereto, and district cables connecting'each end of the zone cable to a, distribution box, certain wires of said zone cable being interrupted, led into certain of the buildings and connected to said terminals therein, whereby a pair of zone cable wires is found in several buildings or" the zone and is adapted to be connected to a tele phone in any one of the buildings as desired.

3. A telephone system comprising a. plurality of buildings or stations, a central station, trunk line cables radiating therefrom, I

distribution boxes at the outer ends-of the trunk line cables, zone cables composed of a plurality of pairs of wires, laid adjacent to a predetermined group of said buildings or stations constituting a zone, a connection box in each building or station comprising a plurality of terminals and removable jumpers for interconnecting the terminals in pairs, and a district cable for connecting each end of each zone cable to a distribution box, certain wires of each zone cable being interrupted, led into certain of the buildings and connected to the terminals of the c0nnection box therein, whereby a pair of zone cable wires is found in more than one building of the zone and is adapted to be con'nectmg sccmiimii 11g :1 mmc u wntral station, and.

means {or cnnuecting each end of the zone able thul'cim 0 Main Wires (if-said Z0119, cable being intcrmptcd, led into certain of the 'bufldi'ugs and wnnectod to said terminals (:1 w a zone cable Wire is found. in mare. than one building of zone and 1 I i l l 1 E 1 may be connected to a telephnne in any one of smd bulldmgs as deslred.

in Wltl'u'fSS whereof, I have hereuntu set my hand tins first day of Aprll 1n the year 1913.

MARTINUS F. GHON VIGH.

Witlwssias: v

.l-LARALD LEIQL'ANN R. W. RASMUSEN. 

